tracks/app/models/project.rb

class Project < ActiveRecord::Base
  has_many :todos, :dependent => :delete_all, :order => 'todos.due IS NULL, todos.due ASC, todos.created_at ASC'
  has_many :notes, :dependent => :delete_all, :order => "created_at DESC"
  has_many :recurring_todos

  belongs_to :default_context, :class_name => "Context", :foreign_key => "default_context_id"
  belongs_to :user

  scope :active, :conditions => { :state => 'active' }
  scope :hidden, :conditions => { :state => 'hidden' }
  scope :completed, :conditions => { :state => 'completed'}
  scope :uncompleted, :conditions => ["NOT(state = ?)", 'completed']

  scope :with_name_or_description, lambda { |body| where("name LIKE ? OR description LIKE ?", body, body) }

  validates_presence_of :name
  validates_length_of :name, :maximum => 255
  validates_uniqueness_of :name, :scope => "user_id"

  acts_as_list :scope => 'user_id = #{user_id} AND state = \'#{state}\'', :top_of_list => 0

  include AASM
  aasm_column :state
  aasm_initial_state :active

  # extend NamePartFinder
  # include Tracks::TodoList

  aasm_state :active
  aasm_state :hidden, :enter => :hide_todos, :exit => :unhide_todos
  aasm_state :completed, :enter => :set_completed_at_date, :exit => :clear_completed_at_date

  aasm_event :activate do
    transitions :to => :active,   :from => [:active, :hidden, :completed]
  end

  aasm_event :hide do
    transitions :to => :hidden,   :from => [:active, :completed]
  end

  aasm_event :complete do
    transitions :to => :completed, :from => [:active, :hidden]
  end

  attr_protected :user
  attr_accessor :cached_note_count

  def self.null_object
    NullProject.new
  end

  def self.create_from_todo(todo)
    project = Project.new(:name => todo.description,
                          :description => todo.notes,
                          :default_context => todo.context)

    project.user = todo.user

    if project.valid?
      todo.destroy
      project.save!
    end

    project
  end

  def hide_todos
    todos.each do |t|
      unless t.completed? || t.deferred?
        t.hide!
        t.save
      end
    end
  end

  def unhide_todos
    todos.each do |t|
      if t.project_hidden?
        t.unhide!
        t.save
      end
    end
  end

  def set_completed_at_date
    self.completed_at = Time.zone.now
  end

  def clear_completed_at_date
    self.completed_at = nil
  end

  def note_count
    # TODO: test this for eager and not eager loading!!!
    return 0 if notes.size == 0
    cached_note_count || notes.count
  end

  alias_method :original_default_context, :default_context

  def default_context
    original_default_context.nil? ? Context.null_object : original_default_context
  end

  # would prefer to call this method state=(), but that causes an endless loop
  # as a result of acts_as_state_machine calling state=() to update the attribute
  def transition_to(candidate_state)
    case candidate_state.to_sym
      when aasm_current_state
        return
      when :hidden
        hide!
      when :active
        activate!
      when :completed
        complete!
    end
  end

  def needs_review?(current_user)
    return active? && ( last_reviewed.nil? ||
                        (last_reviewed < current_user.time - current_user.prefs.review_period.days))
  end

  def blocked?
    ## mutually exclusive for stalled and blocked
    # blocked is uncompleted project with deferred or pending todos, but no next actions
    return false if self.completed?
    return !self.todos.deferred_or_blocked.empty? && self.todos.not_deferred_or_blocked.empty?
  end

  def stalled?
    # Stalled projects are active projects with no active next actions
    return false if self.completed? || self.hidden?
    return self.todos.deferred_or_blocked.empty? && self.todos.active.empty?
  end

  def shortened_name(length=40)
    name.truncate(length, :omission => "...").html_safe
  end

  def name=(value)
    self[:name] = value.gsub(/\s{2,}/, " ").strip
  end

  def new_record_before_save?
    @new_record_before_save
  end

  def age_in_days
    @age_in_days ||= (Date.today - created_at.to_date + 1).to_i
  end

end

class NullProject

  def hidden?
    false
  end

  def nil?
    true
  end

  def id
    nil
  end

end